I've developed a nice application on the ATtiny817 Xplained Mini and am trying to load/start my code with an Atmel ICE, pretending the Xplained is a a production board. Info on how to connect the Atmel ICE (basic kit) seems sparse. I agree it's rather redundant with what Xplained already offers but want to confirm what I can/can't do with just Vcc/GND/UPDI signals connected before I spend a lot on prototype boards (wished 817 had a DIP version). The Xplained PCB has the SPI (J200) which looks like the right interface but the pin 1 is labelled PC1 instead of UPDI. Does the manual say that putting a jumper (0 ohm resister) across R200 will make this UPDI instead instead of PC1? (I tried this but the pad lifted and got lost in solder somewhere - so wanted to assure this is the right course of action before digging back on the trace.) I also realized that for VCC and GND to be correct on the UPDI 6 pin definition, I need to solder the header on the back side of the board! (Am I missing something?). I tried soldering wires to my own free floating header - VCC, GND and UPDI (from the "PA0" labelled via above the "e" in "Atmel" on the PCB). I had the standard USB plugged into Xplained (to power the PCB). Vcc and GND scoped correctly on the Atmel ICE header. But as soon as I connect the ICE to the Xplained, Vcc goes to GND! This was a virgin (never been programmed) Xplained. Of course with Vcc at 0V, it wont program. I paid the high price for an ICE thinking I was avoiding such headaches.
Why doesn't this work, and how are others connecting the ICE to Xplained? (Thanks!)